Cross sections for L-subshell ionization in Au by the collision of protons and helium ions

S. Datz; J. L. Duggan; L. C. Feldman; E. Laegsgaard; J. U. Andersen

doi:10.1103/PhysRevA.9.192

Cross sections for L-subshell ionization in Au by the collision of protons and helium ions

S. Datz, J. L. Duggan, L. C. Feldman, E. Laegsgaard, J. U. Andersen

Rutgers University

Research output: Contribution to journal › Article › peer-review

119 Citations (Scopus)

Abstract

Absolute ionization cross sections for the L subshells of Au by proton bombardment (0.25-5.2 MeV) have been determined from data obtained using a Si(Li) detector and the presently available values for radiative transition probabilities, fluorescence yields, and Coster-Kronig factors. The measured cross sections are compared with values calculated by Choi using the plane-wave Born approximation (PWBA) with either relativistic or nonrelativistic hydrogenic wave functions for the Au electrons. Except at low energies (ηLθL2<0.2) where the uncorrected PWBA is questionable, the agreement is good. A plateau in the 2s ionization cross section attributable to the bimodal 2s-electron wave function is observed in the region 0.5-1.0 MeV. Ionization by He ions (1-12 MeV) is similar, but significant differences in subshell behavior are observed.

Original language	English
Pages (from-to)	192-196
Number of pages	5
Journal	Physical Review A
Volume	9
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevA.9.192
Publication status	Published - 1974

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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title = "Cross sections for L-subshell ionization in Au by the collision of protons and helium ions",

abstract = "Absolute ionization cross sections for the L subshells of Au by proton bombardment (0.25-5.2 MeV) have been determined from data obtained using a Si(Li) detector and the presently available values for radiative transition probabilities, fluorescence yields, and Coster-Kronig factors. The measured cross sections are compared with values calculated by Choi using the plane-wave Born approximation (PWBA) with either relativistic or nonrelativistic hydrogenic wave functions for the Au electrons. Except at low energies (ηLθL2<0.2) where the uncorrected PWBA is questionable, the agreement is good. A plateau in the 2s ionization cross section attributable to the bimodal 2s-electron wave function is observed in the region 0.5-1.0 MeV. Ionization by He ions (1-12 MeV) is similar, but significant differences in subshell behavior are observed.",

author = "S. Datz and Duggan, {J. L.} and Feldman, {L. C.} and E. Laegsgaard and Andersen, {J. U.}",

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T1 - Cross sections for L-subshell ionization in Au by the collision of protons and helium ions

AU - Datz, S.

AU - Duggan, J. L.

AU - Feldman, L. C.

AU - Laegsgaard, E.

AU - Andersen, J. U.

N1 - Funding Information: Research sponsored by the U.S. Atomic Energy Commission under contract with Union Carbide Corporation.

PY - 1974

Y1 - 1974

N2 - Absolute ionization cross sections for the L subshells of Au by proton bombardment (0.25-5.2 MeV) have been determined from data obtained using a Si(Li) detector and the presently available values for radiative transition probabilities, fluorescence yields, and Coster-Kronig factors. The measured cross sections are compared with values calculated by Choi using the plane-wave Born approximation (PWBA) with either relativistic or nonrelativistic hydrogenic wave functions for the Au electrons. Except at low energies (ηLθL2<0.2) where the uncorrected PWBA is questionable, the agreement is good. A plateau in the 2s ionization cross section attributable to the bimodal 2s-electron wave function is observed in the region 0.5-1.0 MeV. Ionization by He ions (1-12 MeV) is similar, but significant differences in subshell behavior are observed.

AB - Absolute ionization cross sections for the L subshells of Au by proton bombardment (0.25-5.2 MeV) have been determined from data obtained using a Si(Li) detector and the presently available values for radiative transition probabilities, fluorescence yields, and Coster-Kronig factors. The measured cross sections are compared with values calculated by Choi using the plane-wave Born approximation (PWBA) with either relativistic or nonrelativistic hydrogenic wave functions for the Au electrons. Except at low energies (ηLθL2<0.2) where the uncorrected PWBA is questionable, the agreement is good. A plateau in the 2s ionization cross section attributable to the bimodal 2s-electron wave function is observed in the region 0.5-1.0 MeV. Ionization by He ions (1-12 MeV) is similar, but significant differences in subshell behavior are observed.

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Cross sections for L-subshell ionization in Au by the collision of protons and helium ions

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